Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 58, Issue 1, Pages 388-399Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2021.3118657
Keywords
Matrix converters; Topology; Computational modeling; Power system measurements; Density measurement; Voltage control; Routing; Power balance controller (PBC); dual-active-bridge (DAB); matrix-converter (MC); multilevel converter; phase-shift; solid-state transformer (SST)
Funding
- National Research Foundation (NRF), Prime Minister's Office, Singapore, under its Campus for Research Excellence and Technological Enterprise (CREATE) programme [2021-IPCC-0513.R1]
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This article presents the challenges and mitigation methods of unequal power routing through the submodules of cascaded matrix-based dual-active-bridge (CMB-DAB) and demonstrates the effectiveness of the proposed power balance control (PBC) strategy through simulations and experimental results.
Though the merits of matrix-based dual-active-bridge (MB-DAB) ac-dc converter as a submodule for grid-connected multilevel medium-voltage ac (MVac)-low-voltage dc (LVdc) conversion have been presented in recent literature, its operational challenges in the cascaded configuration have not been explored. The objective of this article is to present the inevitable challenge of unequal power routing through the submodules of cascaded matrix-based dual-active-bridge (CMB-DAB) and its mitigation. The detailed and simplified small-signal model of the CMB-DAB converter along with the proposed power balance control (PBC) strategy required to eliminate the power imbalance issue are explained comprehensively. The simulation results for a 3-cell 52.65-kVA CMB-DAB converter along with scaled-down 5.85 kVA experimental results are presented, to demonstrate the unavoidable power imbalance issue and the proposed PBC strategy as a mitigation technique. The proposed scheme is observed to perform seamlessly with the conventional LVdc bus voltage control and remediate power-routing imbalance issue during the steady-state, load-change and hot plug-in/hot plug-out operations.
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